U.S. patent application number 14/370032 was filed with the patent office on 2015-01-15 for real-time power distribution method and system for lithium battery and redox flow battery energy storage systems hybrid energy storage power station.
This patent application is currently assigned to CHINA ELECTRIC POWER RESEARCH INSTITUTE. The applicant listed for this patent is CHINA CLECTRIC POWER RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINA, ZHANGJIAKOU WIND AND SOLAR POWER ENERGY DEMONSTRA- TION STATION CO. LTD., STATE GRID XIN YUAN COMPAN. Invention is credited to Dong Hui, Xuecui Jia, Xiaokang Lai, Xiangjun Li, Yinming Wang, Si Zhu.
Application Number | 20150019149 14/370032 |
Document ID | / |
Family ID | 48678825 |
Filed Date | 2015-01-15 |
United States Patent
Application |
20150019149 |
Kind Code |
A1 |
Li; Xiangjun ; et
al. |
January 15, 2015 |
Real-time power distribution method and system for lithium battery
and redox flow battery energy storage systems hybrid energy storage
power station
Abstract
The invention provides a lithium battery and redox flow battery
energy storage systems hybrid energy storage power station
real-time power distribution method and system. The system
comprises a communication module, a data storage and management
module, a gross power coordination control module and a real-time
power distribution module. The said method and system not only can
complete the real-time distribution of each battery energy storage
units in the battery energy storage station, but also the aims of
effective control and distribution of the lithium-liquid flow cell
combined energy storage power station and aims of effective control
and distribution of the lithium-flow flow joint energy storage
power station real-time power can be achieved.
Inventors: |
Li; Xiangjun; (Beijing,
CN) ; Hui; Dong; (Beijing, CN) ; Jia;
Xuecui; (Beijing, CN) ; Lai; Xiaokang;
(Beijing, CN) ; Wang; Yinming; (Beijing, CN)
; Zhu; Si; (Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ZHANGJIAKOU WIND AND SOLAR POWER ENERGY DEMONSTRA- TION STATION CO.
LTD., STATE GRID XIN YUAN COMPAN
CHINA CLECTRIC POWER RESEARCH INSTITUTE
STATE GRID CORPORATION OF CHINA |
Zhangjiakou City, Hebei
Haidian District, Beijing
Xicheng District, Beijing |
|
CN
CN
CN |
|
|
Assignee: |
CHINA ELECTRIC POWER RESEARCH
INSTITUTE
Beijing
CN
STATE GRID CORPORATION OF CHINA
Beijing
CN
Zhangjiakou Wind and Solar Power Energy Demonstra- tion Station
Co., Ltd., State Grid Xin Yuan Compa
Zhangjiakou
CN
|
Family ID: |
48678825 |
Appl. No.: |
14/370032 |
Filed: |
December 11, 2012 |
PCT Filed: |
December 11, 2012 |
PCT NO: |
PCT/CN2012/086375 |
371 Date: |
June 30, 2014 |
Current U.S.
Class: |
702/63 |
Current CPC
Class: |
H01M 16/00 20130101;
H01M 8/188 20130101; Y02E 40/10 20130101; Y02E 60/528 20130101;
G01R 31/382 20190101; Y02E 60/10 20130101; H02J 3/32 20130101; H02J
7/007 20130101; G01R 31/3648 20130101; H01M 8/20 20130101; Y02E
60/50 20130101; H02J 7/0027 20130101; H02J 7/34 20130101; H01M
10/052 20130101; H02J 7/04 20130101; Y02E 60/122 20130101; H02J
7/0022 20130101 |
Class at
Publication: |
702/63 |
International
Class: |
G01R 31/36 20060101
G01R031/36 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 31, 2011 |
CN |
201110460632.2 |
Claims
1. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method, is characterized in that, it includes the following steps:
A. reading and storing energy storage power station total active
real-time demand value and battery station relative running
real-time data B. according to total active real-time demand value
and running real-time data being read from the Step A calculating
the active power command value of lithium battery energy storage
sub-station and flow battery energy storage sub-station; C. after
doing a redistribution of the active power command value of lithium
battery energy storage sub-station and flow battery energy storage
sub-station, determining the active power command value of each
lithium battery energy storage unit and flow battery energy storage
unit separately; and D. summarizing the active power command value
of each lithium battery energy storage unit and flow battery energy
storage unit, and then outputting it to the battery energy
storage.
2. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method according to claim 1, is characterized that, in step A, said
the battery energy storage related running data includes:
controllable state, state of charge value, maximum allowable
discharging power and maximum allowable charging power of each
lithium battery energy storage unit and flow battery energy storage
unit.
3. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method according to claim 1, is characterized that, said step B
includes the following steps: B1) filtering the energy storage
station total active power real-time demand value, low-frequency
part of power after filtering is the lithium battery energy storage
sub-station a active power command value; B2) through filtering of
step B1, in addition to low-frequency part of the power the rest of
the power is the flow battery energy storage sub-station active
power command value; B3) judging whether the lithium battery energy
storage sub-station active command value meets the maximum
allowable discharging power and maximum allowable charging power
constraint condition of the corresponding sub-station, and judging
whether the lithium battery energy storage sub-station active
command value meets the maximum allowable discharging power and
maximum allowable charging power constraint condition of the
corresponding sub-station; B4) ff any active power command value of
lithium battery energy storage sub-station or the flow battery
energy storage sub-station violates constraint condition, then
executing step B5, or ending the judgment; B5) according the energy
storage power station total active real-time demand value, the
maximum allowable discharging power of the lithium battery energy
storage sub-station and the flow battery energy storage
sub-station, and the maximum allowable charging power of the
lithium battery energy storage sub-station and he flow battery
energy storage sub-station recalculating the active power command
value of lithium battery energy storage sub-station or the flow
battery energy storage sub-station which violates constraint
condition in step B4; the maximum allowable discharging power of
the lithium battery energy storage sub-station is the sum of each
maximum allowable discharging power of the controllable lithium
battery energy storage sub-station, said the maximum allowable
discharging power of the lithium battery energy storage sub-station
is the sum of each the maximum allowable discharging power of the
controllable lithium battery energy storage sub-station, said the
maximum allowable charging power of the lithium battery energy
storage sub-station is the sum of each the maximum allowable
charging power of the controllable lithium battery energy storage
sub-station, said the maximum allowable charging power of the
lithium battery energy storage sub-station is the sum of each the
maximum allowable charging power of the controllable lithium
battery energy storage sub-station.
4. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method according to claim 3, is characterized that, said constraint
condition in step B3 refers to: when the lithium battery energy
storage sub-station active command value is greater than zero, the
lithium battery energy storage sub-station active command value is
equal or less than the maximum allowable discharging power of the
lithium battery energy storage sub-station; when the lithium
battery energy storage sub-station active command value is less
than zero, the lithium battery energy storage sub-station active
command value is equal or less than the absolute value of the
maximum allowable charging power of the lithium battery energy
storage sub-station; when the flow battery energy storage
sub-station active command value is greater than zero, the flow
battery energy storage sub-station active command value is equal or
less than the maximum allowable discharging power of the flow
battery energy storage sub-station; and when the flow battery
energy storage sub-station active command value is less than zero,
the flow battery energy storage sub-station active command value is
equal or less than the absolute value of the maximum allowable
charging power of the flow battery energy storage sub-station.
5. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method and system according to claim 3, is characterized that, said
step B5, the method of recalculating the active power command value
of lithium battery energy storage sub-station or the flow battery
energy storage sub-station which violates constraint condition in
step B4 includes: when the energy storage power station total
active real-time demand value is positive, ratio of the sum of the
values of the maximum allowable discharging power of the lithium
battery energy storage sub-station or the flow battery energy
storage sub-station to the maximum allowable discharging power of
the lithium battery energy storage sub-station and the flow battery
energy storage sub-station, and then multiplying it by total active
power real-time demand value of battery energy storage station,
obtaining the active power demand value of lithium battery energy
storage sub-station and the flow battery energy storage sub-station
separately; when the energy storage power station total active
real-time demand value is negative, ratio of the sum of the values
of the maximum allowable charging power of the lithium battery
energy storage sub-station or the flow battery energy storage
sub-station to the maximum allowable charging power of the lithium
battery energy storage sub-station and the flow battery energy
storage sub-station, and then multiplying it by total active power
real-time demand value of battery energy storage station, obtaining
the active power demand value of lithium battery energy storage
sub-station and the flow battery energy storage sub-station
separately.
6. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method according to claim 1, is characterized that, in step C,
first separately redistributing the active power command value of
lithium battery energy storage sub-station and the flow battery
energy storage sub-station which is calculated in step B, the
active power command value of each lithium battery energy storage
unit and flow battery energy storage unit can be calculated
directly; in the process of redistribution, determining whether a
violation of the maximum allowable discharging power and maximum
allowable charging power constraint condition of the corresponding
sub-station will happen, if any, making an online correction based
on greedy algorithm, and recalculating the active power command
value of each lithium battery energy storage unit and flow battery
energy storage unit: or ending the judgment.
7. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method and system according to claim 1, is characterized that, said
step C includes the following specific steps: Step C1, when the
lithium battery energy storage sub-station active power demand
value is positive, it means that lithium battery energy storage
sub-station will be in the discharging state, the method of
calculating each lithium battery energy storage unit active power
command value unit includes: C11) setting the number of lithium
battery energy storage units being restricted to the maximum
allowable discharging power in the lithium battery energy storage
sub-station is M and initializes the variable M; According to ratio
of the sum of the values of state of charge of controllable lithium
battery energy storage unit for state of charge of c all
controllable lithium battery energy storage units in the lithium
battery energy storage sub-station, And then multiplied by active
power command value of battery energy storage sub-station, to
calculate the active power command value of all lithium battery
energy storage units; said state of charge of controllable lithium
battery energy storage unit is the product of its state of charge
and state of controllable; C12) judging whether the active power
command value of all lithium battery energy storage units meets the
constraint condition of the maximum allowable discharging power, if
any lithium battery energy storage unit violates the constraint
condition, then for M=M+1, and executes step C13; Otherwise, skip
to step C15; C13) according to calculate the ratio of lithium
battery energy storage unit violated the maximum allowable
discharging power constraint condition for the maximum allowable
discharging power of that unit, to obtain eigenvalue of the maximum
allowable discharging power violated constraint condition of each
lithium battery energy storage unit; C14) select lithium battery
energy storage unit with maximum discharging power eigenvalue form
the lithium battery energy storage units violated the maximum
allowable discharging power constraint condition, if there is more
than one battery energy storage unit satisfied the condition, and
then select a battery energy storage with the maximum value of
state of charge, and based on the following formula recalculates
the rest lithium battery energy storage unit active power command
value which not restricted to the maximum discharging power, then
skips to step C12; P lithiumj = u lithiumj SOC lithiumj j = 1 L - M
( u lithiumj SOC lithiumj ) ( P lithiumsub - station - i = 1 M P
lithiumi maximumallowabledischarging ) ##EQU00033## C15) judging
whether the sum of each lithium battery energy storage unit power
command value calculated via the above formula meets the
co-ordination of supply and demand constraint condition of lithium
battery energy storage sub-station active power, if can not meet
the judgment condition, then recalculate the rest lithium battery
energy storage unit active power command value which not restricted
to the maximum discharging power: P lithiumj = u lithiumj P
lithiumj maximumallowabledischarging j = 1 L - M ( u lithiumj P
lithiumj maximumallowabledischarging ) ( P lithiumsub - station - i
= 1 M P lithiumi maximumallowabledischarging ) ##EQU00034## Step
C2, when the lithium battery energy storage sub-station active
power command value is negative means that lithium battery energy
storage sub-station will be in the state of charging, and the
method of calculating each lithium battery energy storage unit
active power command value includes: C21) setting the number of
lithium battery energy storage units being restricted to the
maximum allowable charging power in the lithium battery energy
storage sub-station is N and initializes the variable N; According
to ratio of the sum of the values of state of charge of
controllable lithium battery energy storage unit for state of
discharging of all controllable lithium battery energy storage
units in the lithium battery energy storage sub-station, And then
multiplied by active power command value of battery energy storage
sub-station, to calculate the active power command value of all
lithium battery energy storage units; said state of charge of
controllable lithium battery energy storage unit is the product of
its state of discharging and state of controllable; C22) judging
whether the active power command value of all lithium battery
energy storage units meets the constraint condition of the maximum
allowable charging power, if any lithium battery energy storage
unit violates the constraint condition, then for N=N+1, and
executes step C23; Otherwise, skips to step C25; C23) according to
calculate the ratio of lithium battery energy storage unit violated
the maximum allowable charging power constraint condition for the
maximum allowable charging power of that unit, to obtain eigenvalue
of the maximum allowable charging power violated constraint
condition of each lithium battery energy storage unit; C24) select
lithium battery energy storage unit with maximum charging power
eigenvalue form the lithium battery energy storage units violated
the maximum allowable charging power constraint condition, if there
is more than one battery energy storage unit satisfied the
condition, and then select a battery energy storage with the
minimum value of state of charge, and based on the following
formula recalculates the rest lithium battery energy storage unit
active power command value which not restricted to the maximum
charging power, then skips to step C12; P lithiumi = u lithiumj SOD
lithiumj j = 1 L - N ( u lithiumj SOD lithiumj ) ( P lithiumsub -
station - i = 1 M P lithiumi maximumchargingpower ) ##EQU00035##
C25) judging whether the sum of each lithium battery energy storage
unit power command value calculated via the above formula meets the
co-ordination of supply and demand constraint condition of lithium
battery energy storage sub-station active power, if can not meet
the judgment condition, then recalculate the rest lithium battery
energy storage unit active power command value which not restricted
to the maximum charging power. P ? = u j P ? ? j = 1 L - M ( u j P
? ? ) ( P ? - i = 1 M P ? ? ) ##EQU00036## ? indicates text missing
or illegible when filed ##EQU00036.2## Step C3, when the lithium
battery energy storage sub-station active power command value is
zero means that lithium battery energy storage sub-station will be
in the state of zero power, and setting all the lithium battery
energy storage unit active power command value to zero. Step C4,
when the flow battery energy storage sub-station active power
demand value is positive, means that flow battery energy storage
sub-station being in the discharging state, the method of
calculating each flow battery energy storage unit active power
command value includes: C41) setting the number of flow battery
energy storage units being restricted to the maximum allowable
discharging power in the flow battery energy storage sub-station is
M' and initializes the variable M'; According to ratio of the sum
of the values of state of charge of controllable flow battery
energy storage unit for state of charge of c all controllable flow
battery energy storage units in the flow battery energy storage
sub-station, And then multiplied by active power command value of
battery energy storage sub-station, to calculate the active power
command value of all flow battery energy storage units; said state
of charge of controllable flow battery energy storage unit is the
product of its state of charge and state of controllable; C42)
judging whether the active power command value of all flow battery
energy storage units meets the constraint condition of the maximum
allowable discharging power, if any flow battery energy storage
unit violates the constraint condition, then for M'=M'+1, and
executes step C43; Otherwise, skip to step C45; C43) according to
calculate the ratio of flow battery energy storage unit violated
the maximum allowable discharging power constraint condition for
the maximum allowable discharging power of that unit, to obtain
eigenvalue of the maximum allowable discharging power violated
constraint condition of each flow battery energy storage unit; C44)
select flow battery energy storage unit with maximum discharging
power eigenvalue form the flow battery energy storage units
violated the maximum allowable discharging power constraint
condition, if there is more than one battery energy storage unit
satisfied the condition, and then select a battery energy storage
with the maximum value of state of charge, and based on the
following formula recalculates the rest flow battery energy storage
unit active power command value which not restricted to the maximum
discharging power, then skips to step C42; P flow j = u flow j SOC
flow j j = 1 R - M ' ( u flow j SOC flow j ) ( P flow sub - station
- i = 1 M ' [ P flow i - f consumptioni look - up ( P flow i ) ] )
+ P flow j consumption ##EQU00037## C45) judging whether the sum of
each flow battery energy storage unit power command value
calculated via the above formula meets the co-ordination of supply
and demand constraint condition of flow battery energy storage
sub-station active power, if can not meet the judgment condition,
then recalculate the rest flow battery energy storage unit active
power command value which not restricted to the maximum discharging
power: P flow j = u flow j P flow j maximumallowabledischarging j =
1 R - M ' ( u flow j P flow j maximumallowabledischarging ) ( P
flowsub - station - i = 1 M ' [ P flow i - f consumptioni look - up
( P flow i ) ] ) + P flow j consumption ##EQU00038## Step C5, when
the flow battery energy storage sub-station active power command
value is negative means that flow battery energy storage
sub-station will be in the state of charging, and the method of
calculating each flow battery energy storage unit active power
command value includes: C51) setting the number of flow battery
energy storage units being restricted to the maximum allowable
charging power in the flow battery energy storage sub-station is N'
and initializes the variable N'; According to ratio of the sum of
the values of state of charge of controllable flow battery energy
storage unit for state of discharging of all controllable flow
battery energy storage units in the flow battery energy storage
sub-station, And then multiplied by active power command value of
battery energy storage sub-station, to calculate the active power
command value of all lithium battery energy storage units; said
state of charge of controllable flow battery energy storage unit is
the product of its state of discharging and state of controllable;
C52) judging whether the active power command value of all flow
battery energy storage units meets the constraint condition of the
maximum allowable charging power, if any flow battery energy
storage unit violates the constraint condition, then for N'=N'+1,
and executes step C53; Otherwise, skips to step C55; C53) according
to calculate the ratio of flow battery energy storage unit violated
the maximum allowable charging power constraint condition for the
maximum allowable charging power of that unit, to obtain eigenvalue
of the maximum allowable charging power violated constraint
condition of each flow battery energy storage unit; C54) select
flow battery energy storage unit with maximum charging power
eigenvalue form the flow battery energy storage units violated the
maximum allowable charging power constraint condition, if there is
more than one battery energy storage unit satisfied the condition,
and then select a battery energy storage with the minimum value of
state of charge, and based on the following formula recalculates
the rest flow battery energy storage unit active power command
value which not restricted to the maximum charging power, then
skips to step C52; P flowj = u flowj SOD flowj j = 1 R - N ' ( u
flowj SOD flowj ) ( P flow sub - station - i = 1 N ' ( P flowi - f
consumptioni look - up ( P flowi ) ) ) + P flowj consumption
##EQU00039## C55) judging whether the sum of each flow battery
energy storage unit power command value calculated via the above
formula meets the co-ordination of supply and demand constraint
condition of flow battery energy storage sub-station active power,
if can not meet the judgment condition, then recalculate the rest
flow battery energy storage unit active power command value which
not restricted to the maximum charging power; P flowj = u flowj P
flowj maximumallowabledischarging j = 1 R - N ' ( u flowj P flowj
maximumallowabledischarging ) ( P flow sub - station - i = 1 N ' [
P flowi - f consumption i look - up ( P flowi ) ] ) + P flowj
consumption ##EQU00040## Step C6, when the flow battery energy
storage sub-station active power demand value is positive, means
that flow battery energy storage sub-station being in the hot
standby state, the method of calculating each flow battery energy
storage unit active power command value includes: C61) obtain each
flow battery energy storage unit power consumption value by the
look-up table method, and based on the state of controllable and
power consumption value of each flow battery energy storage unit to
calculate each flow battery energy storage unit active power
command value; C62) judging whether the active power command value
of all flow battery energy storage units meets the constraint
condition of the maximum allowable discharging power, if any flow
battery energy storage unit violates the constraint condition,
executes step C63, otherwise, ends the judgment; C63) based on the
following conditions, dealing with each redox flow battery energy
storage unit accordingly: if permitted to get power from the
grid-side for redox flow battery energy storage unit, to maintain
being in the hot standby state with zero power, that makes redox
flow battery energy storage unit active power command value is
zero, and getting power from the grid-side to supply the power
consumption of the redox flow battery energy storage unit;
if not permitted to get power from the grid-side for redox flow
battery energy storage unit, to maintain being in the hot standby
state with zero power, that makes redox flow battery energy storage
unit active power command value is zero, and do stop processing
with that battery energy storage unit; where in the formula,
u.sub.lithiumj, u.sub.flowj is the lithium battery energy storage
unit and redox flow battery energy storage unit controllable state
value of sign of j; sign of is the discharging state of lithium
battery energy storage unit and redox flow battery energy storage
unit, SOC.sub.lithiumj and SOC.sub.flowj is the discharging state
of lithium battery energy storage unit and redox flow battery
energy storage unit, SOD.sub.lithiumj=1-SOC.sub.lithiumj,
SOD.sub.redox flow j=1-SOC.sub.redox flowj;
P.sub.lithiumi.sup.maximumallowabledischarging and
P.sub.lithiumi.sup.maximumallowablecharging is the maximum
allowable charging power and the maximum allowable discharging
power of the lithium battery energy storage unit of sign of i;
P.sub.lithiumsub-station and P.sub.redox flow sub-station is the
active power command value of the lithium battery energy storage
sub-station and the redox flow battery energy storage sub-station;
L, R is the sum of the lithium battery energy storage unit and the
redox flow battery energy storage unit; P.sub.redox flow
j.sup.consumption is the power consumption value of the redox flow
battery energy storage unit.
8. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method and system according to claim 7, is characterized that: said
the maximum allowable discharging power constraint condition in
step C12: the lithium battery energy storage unit active power
command value is equal or less than the maximum allowable
discharging power of the said unit; said the maximum allowable
charging power constraint condition in step C22: the absolute value
of the lithium battery energy storage unit active power command
value is equal or less than the absolute value of the said unit
maximum allowable charging power; said the co-ordination of supply
and demand constraint condition of the lithium battery energy
storage sub-station in step C15 and C25: the sum of all the lithium
battery energy storage units is equal to the active power demand of
the present lithium battery energy storage sub-station; said the
maximum allowable discharging power constraint condition in step
C42: the redox flow battery energy storage unit active power
command value is equal or less than the maximum allowable
discharging power of the said unit; said the maximum allowable
charging power constraint condition in step C52: the absolute value
of the redox flow battery energy storage unit active power command
value is equal or less than the absolute value of the said unit
maximum allowable charging power; said the co-ordination of supply
and demand constraint condition of the redox flow battery energy
storage sub-station in step C45 and C55: the sum of all the redox
flow battery energy storage units is equal to the active power
demand of the present redox flow battery energy storage
sub-station; said the maximum allowable discharging power
constraint condition in step C62: each redox flow battery energy
storage unit active power command value is equal or less than the
maximum allowable discharging power of the said redox flow battery
energy storage unit.
9. A lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method and system, is characterized in that, said system includes:
the communication module uses for reading total active power
real-time demand value and related running data of battery energy
storage master station, and outputs the active power command value
of each lithium battery energy storage unit and redox flow battery
energy storage unit to the battery energy storage grid station; the
data storage and management module uses for storing total active
power real-time demand value and related running data read by
communication module, and transfers the he active power command
value of each lithium battery energy storage unit and redox flow
battery energy storage unit collected by the real-time power
allotter to the communication module; the gross power Coordinated
control module uses for real-time computing active power command
value of the lithium battery energy storage sub-station and the
redox flow battery energy storage sub-station; and the real-time
power distribution module uses for real-time distributing active
power command value of the lithium battery energy storage
sub-station and the redox flow battery energy storage sub-station,
to determine active power command value of each lithium battery
energy storage sub-station and each redox flow battery energy
storage sub-station.
Description
RELATED APPLICATIONS
[0001] This application is a United States National Stage
Application filed under 35 U.S.C 371 of PCT Patent Application
Serial No. PCT/CN2012/086375, filed Dec. 11, 2012, which claims
Chinese Patent Application Serial No. 2011/10460632.2, filed Dec.
31, 2011, the disclosure of all of which are hereby incorporated by
reference in their entirety.
FIELD OF THE INVENTION
[0002] The present invention relates to the smart grid and energy
storage-conversion technology, and particularly to basing on
high-power capacity megawatt lithium battery and redox flow battery
energy storage systems hybrid energy storage power station
real-time power distribution method and system, and more especially
to suiting for battery power and battery energy management method
of the multiple large-scale wind/photovoltaic/energy storage hybrid
power system.
BACKGROUND OF THE INVENTION
[0003] National wind/photovoltaic/energy storage and transmission
demonstration project is first pilot project of the State Grid
Corporation strong smart grid construction, which is the largest
four-in-one renewable energy comprehensive demonstration project of
the world today, including wind power, photovoltaic power, energy
storage and transmission to achieve "grid-friendly" new energy
generation as the goal, and to reflect the "advanced technology,
scientific and technological innovation, demonstration projects,
economic rationality" as features, wherein, National
wind/photovoltaic/energy storage and transmission demonstration
project (A) plans to build wind power device 100 MW, PV device 40
MW and energy storage device 20 MW (including 14 MW of lithium iron
phosphate energy storage systems, 2 MW of vanadium redox flow
battery energy storage system, 4 MW of sodium sulfur battery energy
storage system).
[0004] With lithium-ion batteries, redox flow batteries, sodium
sulfur batteries and integrated technology continues to develop,
applying lithium battery and redox flow battery energy storage
systems hybrid energy storage power station to achieve a variety of
applications of a smooth wind/photovoltaic/energy output, tracking
program generation, participating in system FM, cutting peak and
filling valley, transient active power outputting emergency
response, transient voltage emergency support, etc, this has become
a feasible solution, of which the key problem is that master the
comprehensive integration and control technology of the multiple
large-scale battery energy storage power station.
[0005] From the perspective of energy storage battery, over
charging and over-discharging will affect the life of the battery.
Therefore, monitoring the battery state of charge, with a
reasonable distribution of total power demand in energy storage
power station, and the battery state of charge control in a certain
range is necessary. In high power redox flow battery energy storage
system, flow battery energy storage system's internal power
consumption (hereinafter referred to as consumption) is a real
problem that must be considered. Taking a 175 kilowatts redox flow
battery energy storage units for example, when in the system hot
standby state, in order to maintain the redox flow battery energy
storage units to work, there is about 11% of the system
consumption, and powered by the grid side to compensate. Moreover,
with the AC grid side charging and discharging power changes, the
system consumption is changed.
[0006] In the lithium battery and redox flow battery energy storage
systems hybrid energy storage power station, it is the core problem
how to conduct real-time power distribution and storage of energy.
Currently, there is no disclosing it in patents, literatures,
technical reports and others about total power real-time control
and energy management of the lithium battery and redox flow battery
energy storage systems hybrid energy storage power station.
Therefore, the present invention provides the core technology of
the multiple types large-scale battery energy storage power station
comprehensive control and grid operation, to solve the key issues
of large-scale battery storage power stations coordinated control
and energy management.
SUMMARY OF THE INVENTION
[0007] For the above problems, an object of the present invention
is to provide the lithium battery and redox flow battery energy
storage systems hybrid energy storage station real-time power a
method which is convenient to operate and easy to implement.
[0008] The control method of the present invention is realized by
the following technical solutions:
[0009] A lithium battery and redox flow battery energy storage
systems hybrid energy storage power station real-time power
distribution method includes the following steps:
[0010] A. Reading and storing energy storage power station total
active real-time demand value and battery station running real-time
data.
[0011] B. Calculating the active power command value of lithium
battery energy storage sub-station and redox flow battery energy
storage sub-station, according to total active real-time demand
value and running real-time data being read form the Step A.
[0012] C. Redistributing the active power command value of lithium
battery energy storage sub-station and redox flow battery energy
storage sub-station, and then determining the active power command
value of each lithium battery energy storage unit and redox flow
battery energy storage unit separately.
[0013] D. Summarizing the active power command value of each
lithium battery energy storage unit and redox flow battery energy
storage unit, and then output to the battery energy storage.
[0014] Further, in step A, the battery energy storage power station
related running data includes: controllable state, state of charge
value, maximum allowable discharging power and maximum allowable
charging power etc of each lithium battery energy storage unit and
redox flow battery energy storage unit.
[0015] Further, said step B includes the following steps:
[0016] B1) Filtering the energy storage power station total active
real-time demand value, low-frequency part of power after filtering
is the lithium battery energy storage sub-station a active power
command value;
[0017] B2) Through filtering of step B1, in addition to
low-frequency part of the power the rest of the power is the redox
flow battery energy storage sub-station an active power command
value;
[0018] B3) Judging whether the lithium battery energy storage
sub-station and the redox flow battery energy storage sub-station
active command value meets the maximum allowable discharging power
and maximum allowable charging power constraint condition of the
corresponding sub-station;
[0019] B4) If any active power command value of lithium battery
energy storage sub-station or the redox flow battery energy storage
sub-station violates constraint condition, then execute step B5, or
end the judgment;
[0020] B5) According the energy storage power station total active
real-time demand value, the maximum allowable discharging power of
the lithium battery energy storage sub-station and he redox flow
battery energy storage sub-station, and the maximum allowable
charging power of the lithium battery energy storage sub-station
and the redox flow battery energy storage sub-station to
recalculate the active power command value of lithium battery
energy storage sub-station or the redox flow battery energy storage
sub-station which violates constraint condition in step B4;
[0021] Said the maximum allowable discharging power of the lithium
battery energy storage sub-station is the sum of each the maximum
allowable discharging power of the controllable lithium battery
energy storage sub-station, said the maximum allowable discharging
power of the lithium battery energy storage sub-station is the sum
of each the maximum allowable discharging power of the controllable
lithium battery energy storage sub-station, said the maximum
allowable charging power of the lithium battery energy storage
sub-station is the sum of each the maximum allowable charging power
of the controllable lithium battery energy storage sub-station,
said the maximum allowable charging power of the lithium battery
energy storage sub-station is the sum of each the maximum allowable
charging power of the controllable lithium battery energy storage
sub-station.
[0022] Wherein the maximum allowable discharging power of the
lithium battery energy storage unit is the product of the maximum
allowable discharging power of the controllable lithium battery
energy storage unit and its controllable state, the maximum
allowable discharging power of the redox flow battery energy
storage unit is the product of the controllable maximum allowable
discharging power of the redox flow battery energy storage unit and
its controllable state, the maximum allowable charging power of the
redox flow battery energy storage unit is the product of the
controllable maximum allowable charging power of the redox flow
battery energy storage unit and its controllable state, the maximum
allowable charging power of the redox flow battery energy storage
unit is the product of the controllable maximum allowable charging
power of the redox flow battery energy storage unit and its
controllable state.
[0023] Further, said constraint condition in step B3 is:
[0024] When the lithium battery energy storage sub-station active
command value is greater than zero, the lithium battery energy
storage sub-station active command value is equal or less than the
maximum allowable discharging power of the lithium battery energy
storage sub-station;
[0025] When the lithium battery energy storage sub-station active
command value is less than zero, the lithium battery energy storage
sub-station active command value is equal or less than the absolute
value of the maximum allowable charging power of the lithium
battery energy storage sub-station;
[0026] When the redox flow battery energy storage sub-station
active command value is greater than zero, the redox flow battery
energy storage sub-station active command value is equal or less
than the maximum allowable discharging power of the redox flow
battery energy storage sub-station;
[0027] When the redox flow battery energy storage sub-station
active command value is less than zero, the redox flow battery
energy storage sub-station active command value is equal or less
than the absolute value of the maximum allowable charging power of
the redox flow battery energy storage sub-station.
[0028] Further, in said step B5, the method of recalculating the
active power command value of lithium battery energy storage
sub-station or the redox flow battery energy storage sub-station
which violates constraint condition in step B4 includes:
[0029] When the energy storage power station total active real-time
demand value is positive, ratio of the sum of the values of the
maximum allowable discharging power of the lithium battery energy
storage sub-station or the redox flow battery energy storage
sub-station for the maximum allowable discharging power of the
lithium battery energy storage sub-station and the redox flow
battery energy storage sub-station, and then it is multiplied by
total active power real-time demand value of battery energy storage
station to obtain the active power demand value of lithium battery
energy storage sub-station and the redox flow battery energy
storage sub-station separately;
[0030] Further, in step C, first separately doing a redistribution
of the active power demand value of lithium battery energy storage
sub-station and the redox flow battery energy storage sub-station
calculated in step B, the active power command value of each
lithium battery energy storage unit and redox flow battery energy
storage unit can be calculated directly; in the process of
redistribution, determining whether a violation of the maximum
allowable discharging power and maximum allowable charging power
constraint condition of the corresponding sub-station to happen, if
any, an online correction based on greedy algorithm is made, and
recalculate the active power command value of each lithium battery
energy storage unit and redox flow battery energy storage unit is
made: or the judgment is ended.
[0031] Further, step C includes the following specific steps
[0032] Step C1, When the lithium battery energy storage sub-station
active power demand value is positive, it means that lithium
battery energy storage sub-station being in the discharging state,
the method of calculating each lithium battery energy storage unit
active power command value unit includes:
[0033] C11) Setting the number of lithium battery energy storage
units being restricted to the maximum allowable discharging power
in the lithium battery energy storage sub-station is M and the
variable M is initialized; according to ratio of the sum of the
values of state of charge of controllable lithium battery energy
storage unit for state of charge of c all controllable lithium
battery energy storage units in the lithium battery energy storage
sub-station, And then it is multiplied by active power command
value of battery energy storage sub-station, to calculate the
active power command value of all lithium battery energy storage
units; said state of charge of controllable lithium battery energy
storage unit is the product of its state of charge and state of
controllable;
[0034] C12) Judging whether the active power command value of all
lithium battery energy storage units meets the constraint condition
of the maximum allowable discharging power, if any, lithium battery
energy storage unit violates the constraint condition, then for
M=M+1, and executes step C13; Otherwise, skip to step C15;
[0035] C13) According to calculate the ratio of lithium battery
energy storage unit violated the maximum allowable discharging
power constraint condition for the maximum allowable discharging
power of that unit, to obtain eigenvalue of the maximum allowable
discharging power violated constraint condition of each lithium
battery energy storage unit;
[0036] C14) Selecting lithium battery energy storage unit with
maximum discharging power eigenvalue form the lithium battery
energy storage units violated the maximum allowable discharging
power constraint condition, if there is more than one battery
energy storage unit which meets the condition, and then a battery
energy storage with the maximum value of state of charge is
selected, and based on the following formula there is recalculated
the rest lithium battery energy storage unit active power command
value which not restricted to the maximum discharging power, then
skips to step C12;
P lithiumj = u lithiumj SOC lithiumj j = 1 L - M ( u lithiumj SOC
lithiumj ) ( P lithiumsub - station - i = 1 M P lithiumi
maximumallowabledischarging ) ##EQU00001##
[0037] C15) Judging whether the sum of each lithium battery energy
storage unit power command value calculated via the above formula
meets the co-ordination of supply and demand constraint condition
of lithium battery energy storage sub-station active power, if can
not meet the judgment condition, then the rest lithium battery
energy storage unit active power command value unrestricted to the
maximum discharging power is recalculated:
P lithiumj = u j P lithiumj maximumallowabledischarging j = 1 L - M
( u j P lithiumj maximumallowabledischarging ) ( P lithiumsub -
station - i = 1 M ? ) ##EQU00002## ? indicates text missing or
illegible when filed ##EQU00002.2##
[0038] In step C2, when the lithium battery energy storage
sub-station active power command value is negative, it means that
lithium battery energy storage sub-station will be in the state of
charging, and shows that the method of calculating each lithium
battery energy storage unit active power command value
includes:
[0039] C21) Setting the number of lithium battery energy storage
units being restricted to the maximum allowable charging power in
the lithium battery energy storage sub-station is N and
initialized; According to ratio of the sum of the values of state
of charge of controllable lithium battery energy storage unit for
state of discharging of all controllable lithium battery energy
storage units in the lithium battery energy storage sub-station,
And then multiplied by active power command value of battery energy
storage sub-station, to calculate the active power command value of
all lithium battery energy storage units; said state of charge of
controllable lithium battery energy storage unit is the product of
its state of discharging and state of controllable.
[0040] C22) Judging whether the active power command value of all
lithium battery energy storage units meets the constraint condition
of the maximum allowable charging power, if any lithium battery
energy storage unit violates the constraint condition, then for
N=N+1, and step C23 is executed; Otherwise, skips to step C25
[0041] C23) Calculating the ratio of lithium battery energy storage
unit violated the maximum allowable charging power constraint
condition to the maximum allowable charging power of that unit, to
obtain eigenvalue of the maximum allowable charging power violated
constraint condition of each lithium battery energy storage unit,
respectively.
[0042] C24) Selecting lithium battery energy storage unit with
maximum charging power eigenvalue form the lithium battery energy
storage units violated the maximum allowable charging power
constraint condition, if there is more than one battery energy
storage unit meeting the condition, and then a battery energy
storage with the minimum value of state of charge is selected, and
based on the following formula there is recalculated the rest
lithium battery energy storage unit active power command value
which not restricted to the maximum charging power, then skipping
to step C12;
P lithiumj = u lithiumj SOD lithiumj j = 1 L - N ( u lithiumj SOD
lithiumj ) ( P lithiumsub - station - i = 1 N P lithiumi
maximumchargingpower ) ##EQU00003##
[0043] C25) Judging whether the sum of each lithium battery energy
storage unit power command value calculated via the above formula
meets the co-ordination of supply and demand constraint condition
of lithium battery energy storage sub-station active power, if
cannot meet the judgment condition, then there is recalculated the
rest lithium battery energy storage unit active power command value
which not restricted to the maximum charging power.
P lithiumj = u j ? j = 1 L - M ( u j ? ) ( P lithiumsub - station -
i = 1 M ? ) ##EQU00004## ? indicates text missing or illegible when
filed ##EQU00004.2##
[0044] Step C3, when the lithium battery energy storage sub-station
active power demand value is zero, it means that lithium battery
energy storage sub-station will be in the state of zero power, and
all the lithium battery energy storage unit active power command
value is set to zero.
[0045] Step C4, When the redox flow battery energy storage
sub-station active power demand value is positive, it means that
redox flow battery energy storage sub-station is in the discharging
state, the method of calculating each redox flow battery energy
storage unit active power command value includes:
[0046] C41) Setting the number of redox flow battery energy storage
units being restricted to the maximum allowable discharging power
in the redox flow battery energy storage sub-station is M' and the
variable M' is initialized; According to ratio of the sum of the
values of state of charge of controllable redox flow battery energy
storage unit to state of charge of all controllable redox flow
battery energy storage units in the redox flow battery energy
storage sub-station, And then is multiplied by active power demand
value of battery energy storage sub-station, to calculate the
active power command value of all redox flow battery energy storage
units; said state of charge of controllable redox flow battery
energy storage unit is the product of its state of charge by state
of controllable;
[0047] C42) Judging whether the active power command value of all
redox flow battery energy storage units meets the constraint
condition of the maximum allowable discharging power, if any redox
flow battery energy storage unit violates the constraint condition,
then for M'=M'+1, and step C43 is executed; Otherwise, skipping to
step C45;
[0048] C43) According to calculate the ratio of redox flow battery
energy storage unit violated the maximum allowable discharging
power constraint condition to the maximum allowable discharging
power of that unit, to obtain eigenvalue of the maximum allowable
discharging power violated constraint condition of each redox flow
battery energy storage unit;
[0049] C44) Selecting redox flow battery energy storage unit with
maximum discharging power eigenvalue form the redox flow battery
energy storage units violated the maximum allowable discharging
power constraint condition, if there is more than one battery
energy storage unit satisfied the condition, and then selecting a
battery energy storage with the maximum value of state of charge,
and based on the following formula there is recalculated the rest
redox flow battery energy storage unit active power command value
which is not restricted to the maximum discharging power, then
skipping to step C42;
P redox flow j = u redox flow j SOC redox flow j j = 1 R - M ' ( u
redox flow j SOC redox flow j ) ( P redox flow substation - i = 1 M
' [ P redox flow i - f consumption look - up ( P redox flow i ) ] ?
? indicates text missing or illegible when filed ##EQU00005##
[0050] C45) Judging whether the sum of each redox flow battery
energy storage unit power command value calculated via the above
formula meets the co-ordination of supply and demand constraint
condition of redox flow battery energy storage sub-station active
power, if cannot meet the judgment condition, then the rest redox
flow battery energy storage unit active power command value which
not restricted to the maximum discharging power is
recalculated;
P redox flow j = u redox flow j P redox flow j
maximumallowabledischarging j = 1 R - M ' ( u redox flow j P redox
flow j maximumallowabledischarging ) ( P redox flow substation - i
= 1 M ' [ P redox flow i - f consumption i look - up ( P redox flow
j ) ] ? ? indicates text missing or illegible when filed
##EQU00006##
[0051] Step C5, when the redox flow battery energy storage
sub-station active power demand value is negative which means that
redox flow battery energy storage sub-station will be in the state
of charging, and the method of calculating each redox flow battery
energy storage unit active power command value includes:
[0052] C51) Setting the number of redox flow battery energy storage
units being restricted to the maximum allowable charging power in
the redox flow battery energy storage sub-station is N' and
initializing the variable N'; According to ratio of the sum of the
values of state of charge of controllable redox flow battery energy
storage unit to state of discharging of all controllable redox flow
battery energy storage units in the redox flow battery energy
storage sub-station, and then there is multiplied by active power
demand value of battery energy storage sub-station, to calculate
the active power command value of all lithium battery energy
storage units; said state of charge of controllable redox flow
battery energy storage unit is the product of its state of
discharging by state of controllable;
[0053] C52) Judging whether the active power command value of all
redox flow battery energy storage units meets the constraint
condition of the maximum allowable charging power, if any redox
flow battery energy storage unit violates the constraint condition,
then for N'=N'+1, and executing step C53; Otherwise, skipping to
step C55;
[0054] C53) According to calculate the ratio of redox flow battery
energy storage unit violated the maximum allowable charging power
constraint condition to the maximum allowable charging power of
that unit, to obtain eigenvalue of the maximum allowable charging
power violated constraint condition of each redox flow battery
energy storage unit;
[0055] C54) Selecting redox flow battery energy storage unit with
maximum charging power eigenvalue form the redox flow battery
energy storage units violated the maximum allowable charging power
constraint condition, if there is more than one battery energy
storage unit satisfied the condition, and then selecting a battery
energy storage with the minimum value of state of charge, and based
on the following formula there is recalculated the rest redox flow
battery energy storage unit active power command value which not
restricted to the maximum charging power, then skipping to step
C52;
P redox flow j = u redox flow j SOD redox flow j j = 1 R - N ' ( u
redox flow j SOD redox flow j ) ( P redox flow sub - station - i =
1 N ' [ P redox flow i - f consumption i look - up ( P redox flow i
) ] ? ? indicates text missing or illegible when filed
##EQU00007##
[0056] C55) Judging whether the sum of each redox flow battery
energy storage unit power command value calculated via the above
formula meets the co-ordination of supply and demand constraint
condition of redox flow battery energy storage sub-station active
power, if can not meet the judgment condition, then the rest redox
flow battery energy storage unit active power command value which
not restricted to the maximum charging power is recalculated.
P redox flow j = u redox flow j P redox flow j maximum allowable
charging j = 1 R - N ' ( u redox flow j P redox flow j maximum
allowable charging ) ( P redox flow sub - station - i = 1 N ' [ P
redox flow i - f consumption i look - up ? ? indicates text missing
or illegible when filed ##EQU00008##
[0057] Step C6, When the redox flow battery energy storage
sub-station active power demand value is value zero, it means that
redox flow battery energy storage sub-station being in the hot
standby state, therefore the method of calculating each redox flow
battery energy storage unit active power command value
includes:
[0058] C61) Obtaining each redox flow battery energy storage unit
power consumption value by the look-up table method, and basing on
the state of controllable and power consumption value of each redox
flow battery energy storage unit each redox flow battery energy
storage unit active power command value is calculated.
[0059] C62) Judging whether the active power command value of all
redox flow battery energy storage units meets the constraint
condition of the maximum allowable discharging power, if any redox
flow battery energy storage unit violates the constraint condition,
step C63 is executed, otherwise, the judgment is ended.
[0060] C63) Basing on the following conditions, dealing with each
redox flow battery energy storage unit accordingly:
[0061] If permitted to get power from the grid-side for redox flow
battery energy storage unit, to maintain being in the hot standby
state with zero power, that makes redox flow battery energy storage
unit active power command value is value zero, and getting power
from the grid-side to supply the power consumption of the redox
flow battery energy storage unit.
[0062] If not permitted to get power from the grid-side for redox
flow battery energy storage unit, to maintain being in the hot
standby state with zero power, that makes redox flow battery energy
storage unit active power command value is zero, and do stop
processing for battery energy storage unit.
[0063] Where in the formula, u.sub.lithiumj, u.sub.flowj is the
lithium battery energy storage unit and redox flow battery energy
storage unit controllable state value of sign of j; sign of j is
the discharging state of lithium battery energy storage unit and
redox flow battery energy storage unit, SOC.sub.lithiumj, and
SOC.sub.flowj is the discharging state of lithium battery energy
storage unit and redox flow battery energy storage unit,
SOD.sub.lithiumj=1-SOC.sub.lithiumj, SOD.sub.redox
flowj=1-SOC.sub.redox flowj;
P.sub.lithiumi.sup.maximumallowabledischarging and
P.sub.lithiumi.sup.maximumallowablecharging is the maximum
allowable charging power and the maximum allowable discharging
power of the lithium battery energy storage unit of sign of i;
P.sub.lithiumsub-station and P.sub.flow sub-station is the active
power command value of the lithium battery energy storage
sub-station and the redox flow battery energy storage sub-station;
L. R is the sum of the lithium battery energy storage unit and the
redox flow battery energy storage unit; P.sub.redox
flowj.sup.consumption is the power consumption value of the redox
flow battery energy storage unit.
[0064] Further, said the maximum allowable discharging power
constraint condition in step C12 is that the lithium battery energy
storage unit active power command value is equal or less than the
maximum allowable discharging power of the said unit; said the
maximum allowable charging power constraint condition in step C22
is that the absolute value of the lithium battery energy storage
unit active power command value is equal or less than the absolute
value of said unit maximum allowable charging power; said the
co-ordination of supply and demand constraint condition of the
lithium battery energy storage sub-station in step C15 and C25 is
that the sum of all the lithium battery energy storage units is
equal to the active power demand of the present lithium battery
energy storage sub-station; said the maximum allowable discharging
power constraint condition in step C42 is that the redox flow
battery energy storage unit active power command value is equal or
less than the maximum allowable discharging power of the said unit;
said the maximum allowable charging power constraint condition in
step C52 is that the absolute value of the redox flow battery
energy storage unit active power command value is equal or less
than the absolute value of the said unit maximum allowable charging
power; said the co-ordination of supply and demand constraint
condition of the redox flow battery energy storage sub-station in
step C45 and C55 is that the sum of all the redox flow battery
energy storage units is equal to the active power demand of the
present redox flow battery energy storage sub-station; said the
maximum allowable discharging power constraint condition in step
C62 is that each redox flow battery energy storage unit active
power command value is equal or less than the maximum allowable
discharging power of the said redox flow battery energy storage
unit.
[0065] In said step D, summarizing the power command value of each
lithium battery energy storage unit and each redox flow battery
energy storage unit calculated by step C, which outputs to battery
energy storage station, to execute power distribution of each
lithium battery energy storage unit and each redox flow battery
energy storage unit, and realizes the objective to control the
real-time power of the lithium battery and redox flow battery
energy storage systems hybrid energy storage power station.
[0066] Another object of the present invention is to provide a
lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power distribution
method and system, said system includes:
[0067] Communication module is used for reading total active power
real-time demand value and related running data of battery energy
storage master station, and outputting the active power command
value of each lithium battery energy storage unit and redox flow
battery energy storage unit to the battery energy storage grid
station, to realizes the power distribution of the each battery
energy storage unit in the battery energy storage station;
[0068] The data storage and management module is used for storing
total active power real-time demand value and related running data
read by communication module, and transferring the he active power
command value of each lithium battery energy storage unit and redox
flow battery energy storage unit collected by the real-time power
allotter to the communication module;
[0069] Gross power coordinated control module is used for real-time
computing active power command value of the lithium battery energy
storage sub-station and the redox flow battery energy storage
sub-station; and
[0070] Real-time power distributor is used for real-time
distributing active power command value of the lithium battery
energy storage sub-station and the redox flow battery energy
storage sub-station, to determine active power command value of
each lithium battery energy storage sub-station and each redox flow
battery energy storage sub-station,
[0071] Compared with the existing technology, the present invention
achieves the advantages that:
[0072] A lithium battery and redox flow battery energy storage
systems hybrid energy storage power station real-time power
distribution method and system of the present invention has the
advantages of easy to operate, easy to realize and master in actual
application, said method and system is mainly combined allowable
charging and discharging ability (refers to the maximum allowable
discharging power of each lithium battery energy storage power unit
and each redox flow battery energy storage power unit, the maximum
allowable charging power of each lithium battery energy storage
power unit and each redox flow battery energy storage power unit)
which can express the real-time power character of battery energy
storage unit, and the state of charge SOC which can express the
character of battery joint energy storage unit Storage energy, and
based on the greedy algorithm and the redox flow battery energy
storage power unit system power consumption, to do a online
distribution with the total active power real-time demand value of
battery energy storage station, so that the real-time distribution
of the total active power real-time demand of the lithium-redox
flow battery energy storage station is realized, at the same time
energy management and real-time control of using grid-scale battery
energy storage station is realized. Said method and system takes
the redox flow battery energy storage system power consumption into
the consider of real-time power distribution method, not only
satisfied the demands of the lithium-redox flow battery energy
storage station real-time power distribution, but also solved the
problem of the energy storage real-time supervision, can widely
used.
BRIEF DESCRIPTION OF THE DRAWINGS
[0073] FIG. 1 is an embodiment structure schematic of a lithium
battery and redox flow battery energy storage systems hybrid energy
storage station in the present invention;
[0074] FIG. 2 is an embodiment structure diagram of a lithium
battery and redox flow battery energy storage systems hybrid energy
storage power station real-time power distribution system;
[0075] FIG. 3 is an embodiment flow block diagram of a lithium
battery and redox flow battery energy storage systems hybrid energy
storage station real-time power distribution method;
[0076] FIG. 4 is a corresponding diagram between charging and
discharging power and system power consumption of a 175 kW redox
flow battery energy storage unit, through the look-up table to
look-up the table can find out the said unit real-time system power
consumption value.
DETAILED DESCRIPTION OF EMBODIMENTS
[0077] With the following drawings, the present invention will be
further described.
[0078] FIG. 1, a lithium battery and redox flow battery energy
storage systems hybrid energy storage station includes the lithium
battery energy storage sub-station and the redox flow battery
energy storage sub-station, where in a lithium battery energy
storage sub-station includes bidirectional converter and several
lithium battery energy storage unit, a redox flow battery energy
storage sub-station includes bidirectional converter and several
redox flow battery energy storage unit, through the bidirectional
converter the order of Start-stop control and the charging and
discharging power with each lithium-redox flow battery energy
storage unit is executed.
[0079] FIG. 2 is an embodiment structure diagram of a lithium
battery and redox flow battery energy storage systems hybrid energy
storage power station real-time power distribution system, as shown
in FIG. 2, the technology solution of the present invention is
realized with communication module 10, data storage and management
module20, gross power Coordinated control module 30, real-time
power distribution module 40 settled in the remote server, where in
the said control system, the communication module 10 is connected
to the wired or wireless network of the lithium battery and redox
flow battery energy storage systems hybrid energy storage station,
to complete the interaction and communication between the said
control system and lithium battery and redox flow battery energy
storage systems hybrid energy storage power station, and to realize
the power distribution of each lithium battery energy storage unit
and each redox flow battery energy storage unit in the lithium
battery and redox flow battery energy storage systems hybrid energy
storage power station, and to make real-time power supervision of
the lithium battery and redox flow battery energy storage systems
hybrid energy storage power station
[0080] Communication module 10 is used for receiving total active
power real-time demand value and related running data of lithium
battery and redox flow battery energy storage systems hybrid energy
storage master station, and outputting the active power command
value distributed to each lithium battery energy storage unit and
each redox flow battery energy storage unit.
[0081] The data storage and management module 20 is used for
storing and managing the real-time data and the history data of the
lithium battery and redox flow battery energy storage systems
hybrid energy storage power station at runtime, being in the charge
of collecting the power command value of each lithium battery
energy storage unit and each redox flow battery energy storage
unit, and valuing the related the interface variables, for the
remote server calls through the communication module.
[0082] Gross power coordinated control module 30 is used for
real-time computing active power command value of the lithium
battery energy storage sub-station and the flow battery energy
storage sub-station; and
[0083] Real-time power distribution module 40 is used for real-time
distributing active power command value of the lithium battery
energy storage sub-station and the redox flow battery energy
storage sub-station, to determine active power command value of
each lithium battery energy storage sub-station and each redox flow
battery energy storage sub-station which waiting for
distributing.
[0084] Wherein gross power coordinated control module includes a
filter module, the first execution module and second execution
module:
[0085] The said filter module is used for filtering the energy
storage station total active power demand, low-frequency part of
power after filtering is set as the lithium battery energy storage
sub-station active power command value. And the lithium battery
energy storage sub-station power command value via the first
execution module is determined; After filtering, the rest of the
power is set as the redox flow battery energy storage sub-station
active power command value, and the redox flow battery energy
storage sub-station power command value via the second execution
module is determined.
[0086] Where in the first execution module includes:
[0087] The first judgment sub-module is used for judging charging
and discharging state of the lithium battery energy storage
sub-station: when the lithium battery energy storage sub-station
active power command value is positive, it means that the lithium
battery energy storage sub-station will be in the discharging
state, then through the second judgment sub-module judging the
lithium battery energy storage sub-station power command value;
when the lithium battery energy storage sub-station active power
command value is negative, it means that the lithium battery energy
storage station will be in the charging state, through the third
sub-module the lithium battery energy storage sub-station power
command value is judged; when the lithium battery energy storage
sub-station active power command value is value zero, it means that
the lithium battery energy storage station will be in the
zero-power state, through the first calculation module each lithium
battery energy storage unit power command value is set; the first
calculation sub-module is used for setting the power command value
of lithium battery energy storage sub-station as zero, when the
lithium battery energy storage sub-station active power command
value is value zero.
[0088] The second judgment sub-module is used for setting the
maximum allowable discharging power constraint condition of the
lithium battery energy storage sub-station, and based on the
constraint condition the lithium battery energy storage sub-station
active power command value is judged, if the constraint condition
is violated, then through the second calculation sub-module the
lithium battery energy storage sub-station power command value is
recalculated; the second calculation sub-module is used for
calculating power command value of the lithium battery energy
storage sub-station which violates constraint condition; and
[0089] The third judgment sub-module is used for setting the
maximum allowable charging power constraint condition of the
lithium battery energy storage sub-station, and based on the
constraint condition the lithium battery energy storage sub-station
active power command value is judged, if the constraint condition
is violated, then through the third calculation sub-module the
lithium battery energy storage sub-station power command value
which violate the constrain condition is recalculated; the third
calculation sub-module is used for calculating the lithium battery
energy storage sub-station power command value of violating
constraint condition of the lithium battery energy storage
sub-station maximum allowable charging power;
[0090] Wherein the said the second execution module includes:
[0091] The forth judgment sub-module is used for judging charging
and discharging state of the battery energy storage sub-station:
when the redox flow battery energy storage sub-station active power
command value is positive, it means that the redox flow battery
energy storage sub-station will be in the discharging state, then
through the fifth judgment sub-module the redox flow battery energy
storage sub-station power command value is judged; when the redox
flow battery energy storage sub-station active power command value
is negative, it means that the redox flow battery energy storage
station will be in the charging state, through the sixth judgment
sub-module the redox flow battery energy storage sub-station power
command value is judged; when the redox flow battery energy storage
sub-station active power command value is zero, it means that the
redox flow battery energy storage station will be in the zero-power
state, through the forth calculation module each redox flow battery
energy storage unit power command value is set; the forth
calculation sub-module is used for calculating of power command
value of the redox flow battery energy storage sub-station, when
the redox flow battery energy storage sub-station active power
command value is zero;
[0092] The fifth judgment sub-module is used for setting the
maximum allowable discharging power constraint condition of the
redox flow battery energy storage sub-station, and based on the
constraint condition the redox flow battery energy storage
sub-station active power command value is judged, if constraint
condition is violated, then through the fifth calculation
sub-module the redox flow battery energy storage sub-station power
command value is recalculated; the fifth calculation sub-module is
used for calculating the redox flow battery energy storage
sub-station power command value which violates constraint condition
of the redox flow battery energy storage sub-station maximum
allowable discharging power; and
[0093] The sixth judgment sub-module is used for setting the
maximum allowable charging power constraint condition of the redox
flow battery energy storage sub-station, and based on the
constraint condition the redox flow battery energy storage
sub-station active power command value is judged, if it violates
constraint condition, then through the sixth calculation sub-module
the redox flow battery energy storage sub-station power command
value is recalculated; the sixth calculation sub-module is used for
calculating the redox flow battery energy storage sub-station power
command value which violates constraint condition of the redox flow
battery energy storage sub-station maximum allowable charging
power;
[0094] Wherein the said the real-time power distributor module
includes:
[0095] The Seventh judgment sub-module is used for judging charging
and discharging state of the lithium battery energy storage
sub-station: when the lithium battery energy storage sub-station
active power command value is positive, then through the third
execution sub-module the lithium battery energy storage sub-station
power command value is calculated; when the lithium battery energy
storage sub-station active power command value is negative, it
means that the lithium battery energy storage station will be in
the charging state, the forth execution sub-module calculates the
lithium battery energy storage sub-station power command value;
when the lithium battery energy storage sub-station active power
command value is zero, it means that the lithium battery energy
storage station will be in the zero-power state, the forth
calculation module sets each redox flow battery energy storage unit
power command value; then the fifth execution sub-module sets each
lithium battery energy storage sub-station as zero;
[0096] The third execution module is used for calculating each
lithium battery energy storage unit power command value when the
lithium battery energy storage sub-station active power command
value is positive;
[0097] The fourth execution module is used for calculating each
lithium battery energy storage unit power command value when the
lithium battery energy storage sub-station active power command
value is negative;
[0098] The fifth execution module is used for setting all lithium
battery energy storage unit power command value as zero
directly
[0099] Wherein the said third execution module includes:
[0100] The seventh calculation sub-module is uses for
preliminary-calculating the lithium battery energy storage unit
power command value when the lithium battery energy storage
sub-station active power command value is positive;
[0101] The eighth judgment sub-module is used for setting the
maximum allowable discharging power constraint condition of the
lithium battery energy storage sub-station, and based on the
constraint condition the lithium battery energy storage sub-station
active power command value is judged, if it violates constraint
condition, then the eighth calculation sub-module recalculates the
lithium battery energy storage sub-station power command value; and
then continues to make a judgment through that sub-module, the
judgment is ended until all the lithium battery energy storage unit
power command value meet the maximum allowable discharging power
constraint condition.
[0102] the eighth calculation sub-module is used for calculating
the eigen value of each battery energy storage unit violated the
maximum allowable discharging power constraint condition, and for
selecting one battery energy storage unit form each battery energy
storage unit which violates the maximum allowable discharging power
constraint condition based on greedy algorithm, maximum allowable
discharging power of that unit is set as its power command value,
recalculating the rest battery energy storage unit active power
command value which not restricted to the maximum discharging
power.
[0103] The ninth judgment sub-module is used for setting the
co-ordination of supply and demand constraint condition of the
lithium battery energy storage sub-station active power when the
lithium battery energy storage sub-station active power value is
positive, and based on the constraint condition, the sum of all the
lithium battery energy storage units is judged, if it violates the
constraint condition, then the ninth calculation sub-module
recalculates each lithium battery energy storage unit power command
value; and
[0104] The ninth calculation sub-module is used for calculating
each rest lithium battery energy storage unit active power command
value which not restricted to the maximum discharging power, to
finally determine each lithium battery energy storage unit active
power command value.
[0105] The said forth execution module includes:
[0106] The tenth calculation sub-module is used for
preliminary-calculating the lithium battery energy storage unit
power command value when the lithium battery energy storage
sub-station active power command value is negative;
[0107] The tenth judgment sub-module is used for setting the
maximum allowable charging power constraint condition of the
lithium battery energy storage sub-station, and based on the
constraint condition the lithium battery energy storage sub-station
active power command value is judged, if it violates constraint
condition, then the eleventh calculation sub-module recalculates
the lithium battery energy storage sub-station power command value;
and then continuing to make a judgment through that sub-module,
ending the judgment until all the lithium battery energy storage
unit power command value meet the maximum allowable discharging
power constraint condition;
[0108] The eleventh calculation sub-module is used for calculating
the eigenvalue of each battery energy storage unit which violates
the maximum allowable charging power constraint condition, and
selecting one battery energy storage unit form each battery energy
storage unit which violates the maximum allowable charging power
constraint condition based on greedy algorithm, and setting maximum
allowable discharging power of that unit as its power command
value, recalculating the rest battery energy storage unit active
power command value which not restricted to the maximum charging
power;
[0109] The eleventh judgment sub-module is used for setting the
co-ordination of supply and demand constraint condition of the
lithium battery energy storage sub-station active power when the
lithium battery energy storage sub-station active power value is
negative, and based on the constraint condition, judging the sum of
all the lithium battery energy storage units, if it violates
constraint condition, then the twelfth calculation sub-module
recalculates each lithium battery energy storage unit power command
value; and
[0110] The twelfth calculation sub-module is used for calculating
each rest lithium battery energy storage unit active power command
value which not restricted to the maximum charging power, to
finally determine each lithium battery energy storage unit active
power command value.
[0111] Wherein the said real-time distributor module includes:
[0112] The twelfth judgment sub-module is used for judging charging
and discharging state of the redox flow battery energy storage
sub-station: when the redox flow battery energy storage sub-station
active power command value is positive, then the sixth execution
sub-module calculates the redox flow battery energy storage
sub-station power command value; when the redox flow battery energy
storage sub-station active power command value is negative, it
means that the redox flow battery energy storage station will be in
the charging state, the seventh execution sub-module calculates the
redox flow battery energy storage sub-station power command value;
when active power command value of the redox flow battery energy
storage sub-station is value zero, it means that the redox flow
battery energy storage station will be in the zero-power state, the
eighth execution sub-module calculates power command value of each
redox flow battery storage energy unit;
[0113] The sixth execution module is used for calculating the power
command value of each flow battery energy storage unit when the
redox flow battery energy storage sub-station active power command
value is positive;
[0114] The seventh execution module is used for calculating the
power command value of each redox flow battery energy storage unit
when the redox flow battery energy storage sub-station active power
command value is negative;
[0115] The eight execution module is used for setting power command
value of all redox flow battery energy storage unit when active
power command value of redox flow battery energy storage
sub-station is value zero.
[0116] Wherein said sixth execution module includes:
[0117] The thirteenth calculation sub-module is used for
preliminary-calculating the redox flow battery energy storage unit
power command value when the redox flow battery energy storage
sub-station active power command value is positive;
[0118] The thirteenth judgment sub-module is used for setting the
maximum allowable discharging power constraint condition of the
redox flow battery energy storage sub-station, and based on the
constraint condition judging the redox flow battery energy storage
sub-station active power command value, if it violates constraint
condition, then the fourteenth sub-module recalculates the redox
flow battery energy storage sub-station power command value which
violates it; and then it continue to make a judgment, the judgment
is ended until all the redox flow battery energy storage unit power
command value meet the maximum allowable discharging power
constraint condition;
[0119] The fourteenth calculation sub-module is uses for
calculating the eigenvalue of each redox flow battery energy
storage unit which violates the maximum allowable discharging power
constraint condition, and selecting one battery energy storage unit
form each battery energy storage unit which violates the maximum
allowable discharging power constraint condition based on greedy
algorithm, maximum allowable discharging power of that unit is set
as its power command value, the rest battery energy storage unit
active power command value which not restricted to the maximum
discharging power is recalculated.
[0120] The fourteenth judgment sub-module is used for setting the
co-ordination of supply and demand constraint condition of the
redox flow battery energy storage sub-station active power when the
redox flow battery energy storage sub-station active power value is
positive, and based on the constraint condition, judging the sum of
all the redox flow battery energy storage units, if it violates
constraint condition, then the fifteenth calculation sub-module
recalculates each redox flow battery energy storage unit power
command value;
[0121] The fifteenth calculation sub-module is used for calculating
each rest redox flow battery energy storage unit active power
command value which not restricted to the maximum discharging
power, to finally determine each redox flow battery energy storage
unit power command value.
[0122] Said seventh execution module includes:
[0123] The sixteenth calculation sub-module is used for
preliminary-calculating the redox flow battery energy storage unit
power command value when the redox flow battery energy storage
sub-station active power command value is negative;
[0124] The sixteenth judgment sub-module is uses for setting the
maximum allowable charging power constraint condition of the redox
flow battery energy storage unit, and based on the constraint
condition judging active power command value of the redox flow
battery energy storage unit, if it violates constraint condition,
then the seventeenth calculation sub-module recalculates power
command value of the redox flow battery energy storage unit; and
then the sub-module continus to make a judgment, ending the
judgment until all the redox flow battery energy storage unit power
command value meet the maximum allowable charging power constraint
condition.
[0125] The seventeenth calculation sub-module is used for
calculating the eigenvalue of each redox flow battery energy
storage unit which violates the maximum allowable charging power
constraint condition, and selecting one battery energy storage unit
form each redox flow battery energy storage unit which violates the
maximum allowable charging power constraint condition based on
greedy algorithm, setting maximum allowable charging power of that
unit as its power command value, recalculating the rest redox flow
battery energy storage unit active power command value which not
restricted to the maximum charging power;
[0126] The seventeenth judgment sub-module is used for setting the
co-ordination of supply and demand constraint condition of the
redox flow battery energy storage sub-station active power when the
redox flow battery energy storage sub-station active power value is
negative, and based on the constraint condition, judging the sum of
all the redox flow battery energy storage units, if it violates
constraint condition, then the eighteenth calculation sub-module
recalculates each redox flow battery energy storage unit power
command value;
[0127] The eighteenth calculation sub-module is used for
calculating each rest redox flow battery energy storage unit active
power command value which not restricted to the maximum charging
power, to finally determine each redox flow battery energy storage
unit active power command value.
[0128] Said eighth execution module includes:
[0129] The nineteenth calculation sub-module is uses for
calculating each the redox flow battery energy storage unit power
command value when the zero-power is in the hot standby state;
[0130] The eighteenth judgment sub-module is used for setting the
maximum allowable charging power constraint condition of the redox
flow battery energy storage unit, and based on the constraint
condition, judging active power command value of the redox flow
battery energy storage unit, if it violates constraint condition,
then the ninth execution module is executed;
[0131] Said ninth execution module includes:
[0132] The nineteenth judgment sub-module is used for setting grid
power supplying constraint condition, and based on the constraint
condition judging the condition of the grid power supplying, if
permitted to get power from the grid-side for redox flow battery
energy storage unit, to maintain being in the hot standby state
with zero power, the tenth execution module is executed, otherwise
the eleventh module is executed; said tenth execution module is
used for setting each redox flow battery energy storage unit active
power command value as zero, and using the grid-side power to
supply the redox flow battery energy storage unit consumption.
[0133] Said eleventh execution module, is used for setting each
redox flow battery energy storage unit power command value as zero,
and doing stop-processing to the redox flow battery energy storage
unit.
[0134] FIG. 3 illustrates the diagram of a lithium battery and
redox flow battery energy storage systems hybrid energy storage
station real-time power control algorithm diagram based on greedy
algorithm of the present invention. Below with specific
implementation steps, the embodiment is described in detail, the
method including the steps of:
[0135] Step A, the communication module 10 reads the data that is
reading from the host computer issued a lithium battery and redox
flow battery energy storage systems hybrid energy storage power
station combined total active power real-time demand value and
battery energy storage power station system real-time data at
running time, it mainly includes: battery energy storage station
total active power real-time demand value, each lithium battery
energy storage unit controllable signal, each redox flow battery
energy storage unit controllable signal, the SOC value signal of
each lithium battery energy storage unit and each flow battery
energy storage unit and the maximum allowable discharging power and
the maximum allowable charging power of each lithium battery energy
storage unit and each flow battery energy storage unit, etc., and
then it transfers the data to the data storage and management
module 20 for storage and management.
[0136] Step B, based on the gross power coordinated control module
which real-time computes the active command value of the lithium
storage sub-station and the redox flow battery energy storage
sub-station;
[0137] Step C, based on the real-time power distribution module,
which real-time distributes power command value of the lithium
battery energy storage sub-station and the redox flow battery
energy storage sub-station, to determine active power command value
of each lithium battery energy storage sub-station and each redox
flow battery energy storage sub-station.
[0138] Step D, active power command value of each lithium battery
energy storage unit and each redox flow battery energy storage unit
calculated by step C is collected by the data storage and
management module, the communication module outputs it.
[0139] In step B, the active command value of each lithium battery
energy storage unit and each redox flow battery energy storage unit
is calculated as follows:
[0140] B1) Filtering the total active power real-time demand value
P.sub.energy storagemaster station of the battery energy storage
station based on the filtering algorithm. For example, can use
weighted moving average filter or low-pass filter to control
program. For example, the low-frequency part after being filtered
P.sub.energy storagemaster station can be shared by the lithium the
storage battery sub-station. That is, the lithium battery energy
storage sub-station active command value is calculated as shown in
the following equation.
P.sub.lithiumsub-station=f.sub.filtering(P.sub.energystoragemaster
station) (1)
[0141] That is:
P.sub.lithiumsub-station=f.sub.WMA(P.sub.energystoragemaster)
Or
[0142] P lithiumsub - station = P energystoragemaster 1 + sT
filtering ( 2 ) ##EQU00009##
[0143] B2) The rest part of power after being filtered
P.sub.energystoragemaster station can be shared by the flow the
storage battery sub-station. That is, the redox flow battery energy
storage sub-station active command value calculated as shown in the
following equation.
P.sub.flow sub-station=P.sub.flow master
station-f.sub.filtering(P.sub.flow master station) (3)
[0144] In the formula (2), WMA represents weighted moving average,
T.sub.filtering represents a first-order filter constant.
[0145] B3) determine whether the active power command value of the
lithium battery energy storage sub-station and the redox flow
battery energy storage sub-station which is listed below,
P.sub.lithiumsub-station and P.sub.flow sub-station, meets the
maximum allowable charging and discharging power constraint
condition of the lithium battery energy storage sub-station and the
redox flow battery energy storage sub-station
P lithiumsub - station .ltoreq. P lithiumsub - station
maximumallowabledischarging ( ? ) ( 4 ) P lithiumsub - station
.ltoreq. P lithiumsub - station maximumallowablecharging ( P
lithiumsub - station < 0 ) ( 5 ) ? ( 6 ) P redox flow ? ( ? ) ?
indicates text missing or illegible when filed ( 7 )
##EQU00010##
[0146] B4) If there is any power command value of the lithium
battery energy storage sub-station or the redox flow battery energy
storage sub-station which violates the above said constraint
condition (4)-(7), then it executes the following step 5, otherwise
it is ended.
[0147] B5) The active power command value of the lithium battery
energy storage sub-station or the redox flow battery energy storage
sub-station is calculated as follows:
[0148] When the battery energy storage station total active power
real-time demand value P.sub.energy storagemaster station is
positive,
P = P ithiumsub - station maximum allowabldischargein P lithiumsub
- station maximum allowabledischarging + P flow sub - station
maximum allowabledischargin P energy storagemaster station ( 8 ) P
redox flowsub - station = P redox flowsub - station maximum
allowable discharging P lithium sub - station maximum allowable
discharging + P redox flow sub - station maximum allowable
discharging P energy storage master station ( 9 ) ##EQU00011##
[0149] When the battery energy storage station total active
real-time demand value P.sub.energystoragemaster station is
negative,
P lithiumsub - station = P lithiumsub - station maximum
allowablecharging P lithiumsub - station maximumallowaablecharging
+ P flow sub - station maximumallowablecarging P energy
storagemaster station ( 10 ) P redox flow sub - station = P redox
flow sub - station maximum allowable charging P redox flow sub -
station maximum allowable charging + P redox flowsub - station
maximum allowable charging P energy storage master station ( 11 )
##EQU00012##
[0150] In the formula (1)-(11),
P.sub.lithiumsub-station.sup.maximumallowabledischarging is the
lithium battery energy storage sub-station maximum allowable
discharging power; P.sub.lithiumsub-station.sup.maximum
allowablecharging is the lithium battery energy storage sub-station
maximum allowable charging power; P.sub.redox
flowsub-station.sup.maximum allowable charging is the redox flow
battery energy storage sub-station maximum allowable discharging
power; P.sub.redox flowsub-station.sup.maximum allowable charging
is the redox flow battery energy storage sub-station maximum
allowable charging power;
[0151] In step C, said active power command value of the lithium
battery energy storage unit is calculated as follows:
[0152] In step C1, when the lithium battery energy storage
sub-station active power demand value P.sub.lithiumsub-station is
positive, it indicates that the lithium battery energy storage
sub-station will be in the discharging state, then based on the
state of charge (SOC) and the maximum allowable discharging power
value of each lithium battery energy storage unit by the following
steps to calculate each lithium battery energy storage unit active
power command value P.sub.lithium;
[0153] C11) Setting the number of lithium battery energy storage
unit restricted to the maximum discharging power in the lithium
battery energy storage sub-station is M=0, and the power command
value of lithium battery energy storage unit i is calculated;
P lithiumi = u lithiumi S O C lithiumi i = 1 L ( u lithiumi S O C
lithiumi ) P lithiumsub - station ( 12 ) ##EQU00013##
[0154] C12) Judging whether the active power P.sub.lithiumi each
lithium battery energy storage unit i meets the following maximum
allowable discharging constraint condition of the lithium battery
energy storage unit:
P.sub.lithiumi.ltoreq.P.sub.lithiumi.sup.maximum
allowabledischaging (13)
[0155] If there is any lithium battery energy storage unit which
violates the above said constraint condition (13), then M=M+1, and
the following step C13 is executed, otherwise it skips to the step
C15;
[0156] C13) Based on the following equation calculating the
eigenvalue which violates the maximum allowable discharging
constraint condition of each lithium battery energy storage unit
i:
.kappa. lithiumi discharging = P lithiumi P lithiumi maximum
allowabledischarging ( 14 ) ##EQU00014##
[0157] C14) Based on the following measurement standard, with
greedy algorithm, one battery energy storage unit k is selected
from the ones violates the maximum allowable discharging constraint
condition. Specific implementation method is as follows: First,
from corresponding unit which violates the maximum allowable
discharge power constraint condition, the battery energy storage
unit k with the maximum discharging power eigenvalue is found. If
there are several units meeting the condition, the battery energy
storage unit k with the maximum SOC.sub.lithiumk from the units
satisfied the condition is selected.
[0158] Active power command value of the selected redox flow
battery energy storage unit k is calculated as following
equation:
P.sub.lithiumk=P.sub.lithiumk.sup.maximumallowabledischarging
(15)
[0159] The rest power command value of the lithium battery energy
storage unit j which is not restricted to the maximum allowable
discharging is calculated as following equation:
P lithiumj = u lithiumj S O C lithiumj j = 1 L - M ( u lithiumj S O
C lithiumj ) ( P lithiumsub - station - i = 1 M P lithiumi
maximumallowabledischarging ) ( 16 ) ##EQU00015##
[0160] Skipping to step C12
[0161] C15) Judging whether the sum of each lithium battery energy
storage unit i power command value P.sub.lithiumi calculated by
step C11 or C14 meets the following constraint condition;
i = 1 L P lithiumi = P lithiumsub - station ( 17 ) ##EQU00016##
[0162] If the judgment indicated by equation (17) can not be
satisfied, then based on the following equation the rest power
command value of each lithium battery energy storage unit j which
is not restricted to the maximum discharging power is
recalculated:
P lithiumj = u j P lithiumj maximumallowabledischarging j = 1 L - M
( u j P lithiumj maximumallowabledicsharging ) ( P lithiumsub -
station - i = 1 M P lithiumi maximumallowabledischarging ) ( 18 )
##EQU00017##
[0163] Step C2, when the lithium battery energy storage sub-station
active power command P.sub.lithiumsub-station is negative, it
indicates that the lithium battery energy storage sub-station will
be in the charging state, then according to discharging state of
each lithium battery energy storage unit and the maximum allowable
charging power value, each lithium battery energy storage unit
active power command value P.sub.lithiumi is calculated based on
the following steps:
[0164] C21) Setting the number of lithium battery energy storage
units being restricted to the maximum allowable charging power in
the lithium battery energy storage sub-station is N-0, then
calculating each lithium battery energy storage unit i power
command value;
? = ? ? i = 1 L ? ? ? ? indicates text missing or illegible when
filed ( 19 ) ##EQU00018##
[0165] C22) Judging whether each lithium battery energy storage
unit active power P.sub.lithiumi meets the following the maximum
allowable charging power constraint condition of the battery energy
storage unit.
|P.sub.lithiumi|.ltoreq.|P.sub.lithiumi.sup.maximumallowablecharging|
(20)
[0166] If any lithium battery energy storage unit violates the
above constraint condition as shown in equation (20), then N=N+1,
and executing the following step C23; otherwise skipping to step
C25.
[0167] C23) based on the following equation calculating the
charging power eigenvalue of each lithium battery energy storage
unit which violates the maximum allowable charging power constraint
condition:
.kappa. lithiumi charging = P lithiumi P lithiumi maximum
allowablecharging ( 21 ) ##EQU00019##
[0168] C24) Based on the following measurement standard, with
greedy algorithm, selecting one battery energy storage unit k from
the ones which violates the maximum allowable charging constraint
condition. Specific implementation method is as follows: First,
from the maximum allowable charge battery energy storage unit which
violates constraint condition the battery energy storage unit k
with the maximum charging power eigenvalue is found. If there are
several units meeting the condition, the battery energy storage
unit k with the minimum SOC.sub.lithiumk from the units satisfied
the condition is selected.
[0169] The selected lithium battery energy storage unit k active
power command value is calculated as following equation:
P.sub.lithiumk=P.sub.lithiumk.sup.maximumallowablecharging (22)
[0170] The rest power command value of the lithium battery energy
storage unit j which is not restricted to the maximum allowable
charging is calculated as following equation:
P lithiumj = u lithiumj S O C lithiumj j = 1 L - M ( u lithiumj S O
C lithiumj ) ( P lithiumsub - station - i = 1 M P lithiumi maximum
allowablecharging ) ( 23 ) S O D lithiumj = 1 - S O C lithiumj ( 24
) ##EQU00020##
[0171] Skipping to step C22,
[0172] C25) Judging whether the sum of each lithium battery energy
storage unit i power command value P.sub.lithiumi calculated by
step C21 or C24 meets the following constraint condition;
i = 1 L P lithiumi = P lithiumsub - station ( 25 ) ##EQU00021##
[0173] If the judgment indicated by equation (25) can not be
satisfied, then based on the following equation recalculating the
rest power command value of each lithium battery energy storage
unit j which is not restricted to the maximum charging power:
P lithiumj = u j P lithiumj maximum allowablecharging j = 1 L - M (
u j P lithiumj maximum allowablecharging ) ( P lithiumsub - station
- i = 1 M P lithiumi maximum allowablecharging ) ( 26 )
##EQU00022##
[0174] Equation (12)-(26), u.sub.lithiumi is the controllable state
of the lithium battery energy storage unit i, the state is read by
the step A, when the lithium battery energy storage unit is remote
controlled, the state value is 1, the rest value is 0;
SOC.sub.lithiumi is the state of charge of the lithium battery
energy storage unit i; SOD.sub.lithiumi the discharging state of
the lithium battery energy storage unit i;
P.sub.lithiumi.sup.maximumallowabledischarging is the maximum
allowable discharging power of the lithium battery energy storage
unit i; P.sub.lithiumi.sup.maximum allowablecharging is the maximum
allowable charging power of the lithium battery energy storage
unit; N is the number of the lithium battery energy storage
unit.
[0175] Step C3, when the lithium battery energy storage sub-station
active power command value is value zero, it means that lithium
battery energy storage sub-station will be in the state of zero
power, and setting all the lithium battery energy storage unit
active power command value to zero.
[0176] In step C, the said the redox flow battery energy storage
unit active power command value is calculated as follows:
[0177] In step C4, when the redox flow battery energy storage
sub-station active power demand value P.sub.redox flow sub-station
is positive, it indicates that the redox flow battery energy
storage sub-station will be in the discharging state, then based on
the state of charge (SOC) and the maximum allowable discharging
power value, active power command value P.sub.redox flow i of each
redox flow battery energy storage unit each redox flow battery
energy storage unit is calculated by the following steps:
[0178] C41) Setting the number of redox flow battery energy storage
sub-station which is restricted to the maximum discharging power in
the redox flow battery energy storage sub-station is M'=0, and
calculating the power command value of each redox flow battery
energy storage unit i;
? = u redox flow i ? i = 1 L u redox flow i ? ? ? indicates text
missing or illegible when filed ( 27 ) ##EQU00023##
[0179] C42) Judging whether the active power P.sub.redox flow i of
each lithium battery energy storage unit i meets the following
maximum allowable discharging constraint condition of the redox
flow battery energy storage unit:
P.sub.redox flow i.ltoreq.P.sub.redox flow i.sup.maximum allowable
discharging (28)
[0180] If there is any redox flow battery energy storage unit which
violates the above said constraint condition, then M'=M'+1, and
executing the following step C43, otherwise skipping to the step
C45;
[0181] C43) Based on the following equation calculating the
eigenvalue which violates the maximum allowable discharging power
constraint condition of each redox flow battery energy storage unit
i:
? = ? ? ? indicates text missing or illegible when filed ( 29 )
##EQU00024##
[0182] C44) Based on the following measurement standard, with
greedy algorithm, selecting one redox flow battery energy storage
unit i from the ones which violates the maximum allowable
discharging constraint condition. Specific implementation method is
as follows: First, the redox flow battery energy storage unit i
with the maximum discharging power eigenvalue is found. If there
are several units meeting the condition, the redox flow battery
energy storage unit k with the maximum SOC.sub.redox flow k from
the units which is satisfied with the condition is selected as the
maximum redox flow battery energy storage unit i.
[0183] Active power command value of the selected redox flow
battery energy storage unit i is calculated as following
equation:
P.sub.redox flow k=P.sub.redox flow k.sup.maximum allowable
discharging (30)
[0184] The rest power command value of the redox flow battery
energy storage unit j which is not restricted to the maximum
allowable discharging is calculated as following equation:
P redox flowj = u redox flow j S O C redox flow j j = 1 R - M ' ( u
redox flow j S O C redox flow j ) ( P redox flow sub - station - i
= 1 M ' [ P redox flow i - f consumption i look - up ( P redox flow
i ) ] ) + P fredox flow j consumption ( 31 ) P redox flowj
consumption = f consumption j look - up { u redox flow j S O C
redox flow j j = 1 R - M ' ( u redox flow j S O C redox flow j ) (
P redox flow sub - station - i = 1 M ' [ P redox flow i - f
consumption i look - up ( P redox flow i ) ] ) } ( 32 )
##EQU00025##
[0185] Skipping to step C42
[0186] C45) Judging whether the sum of each redox flow battery
energy storage unit i power command value P.sub.flow i calculated
by the above step meets the following constraint condition;
i = 1 L P redox flow i = P redox flow sub - station ( 33 )
##EQU00026##
[0187] If the judgment indicated by equation (33) can not be
satisfied, then based on the following equation recalculating the
rest power command value of each redox flow battery energy storage
unit j which is not restricted to the maximum allowable discharging
power:
P redox flowj = u redox flow j P redox flow j maximum allowable
discharging j = 1 R - M ' ( u redox flow j P redox flow j maximum
allowable discharging ) ( P redox flow sub - station - i = 1 M ' [
P redox flow i - f consumption i look - up ( P redox flow i ) ] ) +
P redox flow j consumption ( 34 ) P redox flow i consumption = f
consumption j look - up { u redox flow j P redox flow j maximum
allowable discharging j = 1 R - M ' ( u redox flow j P redox flow j
maximum allowable discharging ) ( P redox flow sub - station - i =
1 M ' [ P redox flow i - f consumption i look - up ( P redox flow i
) ] ) + P redox flow i consumption } ( 35 ) ##EQU00027##
[0188] In equation (31)-(35), P.sub.redox flow i is the power
command value of number M' redox flow battery energy storage unit
which is restricted to the maximum discharging power.
[0189] Step 5, when the redox flow battery energy storage
sub-station active power demand P.sub.redox flow sub-station is
negative, it indicates the redox flow battery energy storage
sub-station will be in the charging state, then according to
discharging state of each redox flow battery energy storage unit
and the maximum allowable charging power value, each redox flow
battery energy storage unit active power command value P.sub.redox
flow i based on the following steps is calculated:
[0190] C51) Setting the number of redox flow battery energy storage
units being restricted to the maximum allowable charging power in
the redox flow battery energy storage sub-station is N'-0, then
calculating each redox flow battery energy storage unit i power
command value;
P redox flow i = u redox flow i SOD redox flow i i = 1 R ( u redox
flow i SOD redox flow i ) P redox flow sub - station + u redox flow
i P redox flow i consumption ( 36 ) P redox flow i consumption = f
consumption i look - up ( u redox flow i SOD redux flow i i = 1 R (
u redox flow i SOD redox flow i ) P redox flow sub - station ) ( 37
) ##EQU00028##
[0191] C52) Judging whether each redox flow battery energy storage
unit active power P.sub.redox flow i meets the following the
maximum allowable charging power constraint condition of the
battery energy storage unit.
|P.sub.redox flow i|.ltoreq.|P.sub.redox flow i.sup.maximum
allowable charging| (38)
[0192] If any redox flow battery energy storage unit violates the
above constraint condition, then N'=N'+1, and executing the
following step C53; otherwise it ends.
[0193] C53) Based on the following equation calculating the
charging power eigenvalue of each redox flow battery energy storage
unit which violates the maximum allowable charging power constraint
condition:
.kappa. redox flow i charging = P redox flow i P redox flow i
maximum allowable charging ( 39 ) ##EQU00029##
[0194] C54) Based on the following measurement standard, with
greedy algorithm, one redox flow battery energy storage unit i from
the ones violates the maximum allowable charging constraint
condition is selected. Specific implementation method is as
follows: First, from the maximum allowable charge power violate
constraints the redox flow battery energy storage unit i with the
maximum charging power eigenvalue is found. If there are several
units meeting the condition, one redox flow battery energy storage
unit i with the minimum SOC.sub.redox flow i from the units
satisfied the condition is selected.
[0195] The selected redox flow battery energy storage unit i active
power command value is calculating as following equation:
P.sub.redox flow i=P.sub.redox flow i.sup.maximum allowable
charging (40)
[0196] The rest power command value of the redox flow battery
energy storage unit j which is not restricted to the maximum
allowable charging is calculated as following equation:
P redox flow j = u redox flow j SOD redox flow j j = 1 R - M ' ( u
redox flow j SOD redox flow j ) ( P redox flow sub - station - i =
1 M ' [ P redox flow i - f consumption i look - up ( P redox flow i
) ] ) + P redox flow j consumption ( 41 ) P redox flow j
consumption = f consumption j look - up { u redox flow j SOC redox
flow j j = 1 R - N ' ( u redox flow j SOC redox flow j ) ( P redox
flow sub - station - i = 1 M ' [ P redox flow i - f consumption i
look - up ( P redox flow i ) ] ) } ( 42 ) SOD redox flow j = 1 -
SOC redox flow j ( 43 ) ##EQU00030##
[0197] Skipping to step C52.
[0198] C55) Judging whether the sum of each redox flow battery
energy storage unit i power command value P.sub.flow i meets the
following constraint condition;
i = 1 L P redox flow i = P redox flow sub - station ( 44 )
##EQU00031##
[0199] If the judgment condition indicated by equation (44) cannot
be satisfied, then based on the following equation recalculating
the rest power command value of each redox flow battery energy
storage unit j which is not restricted to the maximum charging
power;
P redox flowj = u redox flow j P redox flow j maximum allowable
charging j = 1 R - N ' ( u redox flow j P redox flow j maximum
allowable charging ) ( P redox flow sub - station - i = 1 N ' ( P
redox flow i - f consumption i look - up ( P redox flow i ) ) ) + P
redox flow j consumption ( 45 ) P redox flow j consumption = f
consumption j look - up { u redox flow j P redox flow j maximum
allowable charging j = 1 R - N ' ( u redox flow j P redox flow j
maximum allowable charging ) ( P redox flow sub - station - i = 1 N
' ( P redox flow i - f consumption j look - up ( P redox flow i ) )
) } ( 46 ) ##EQU00032##
[0200] In equation (41)-(46), P.sub.redox flow i is the power
command value of number N' redox flow battery energy storage unit
which is restricted to the maximum allowable charging power.
[0201] Step 6, when the redox flow battery energy storage
sub-station active power command P.sub.redox flow sub-station is
value zero, it indicates that the redox flow battery energy storage
sub-station will be in the zero power hot standby state, if can
determine the state will not last for a long time, in order to the
redox flow battery energy storage unit AC grid side active power
value maintain zero, each redox flow battery energy storage unit
active power command value P.sub.flow i is calculated based on the
following steps:
[0202] C61) Based on the following equation calculating each redox
flow battery energy storage unit i active power command value:
P.sub.redox flow i=u.sub.redox flow iP.sub.redox flow
i.sup.consumption=u.sub.redox flow if.sub.consumption
i.sup.look-up(0) (47)
[0203] C62) Judging whether each redox flow battery energy storage
unit i active power command value P.sub.redox flow i meets the
following maximum allowable discharging constraint condition of the
redox flow battery energy storage unit.
P.sub.redox flow i.ltoreq.P.sub.redox flow i.sup.maximum allowable
discharging (48)
[0204] If any flow battery energy storage unit violates the above
constraint condition, then N'=N'+1, and the following step C63 is
executed; otherwise it ends.
[0205] C63) Judging based on the following judgment conditions, for
processing
[0206] If allowed to take power from the grid-side to the redox
flow battery energy storage unit, in order to maintain the
zero-power hot standby operation state, another P.sub.redox flow i
is zero, and the grid-side power supply is provided to the redox
flow battery energy storage unit power consumption.
[0207] If not allowed to take power from the grid-side to the redox
flow battery energy storage unit, in order to maintain the
zero-power hot standby operation state, another P.sub.redox flow i
zero, and do stop processing to the redox flow battery energy
storage unit.
[0208] Equation (27)-(48) u.sub.redox flow i is the controllable
state of the redox flow battery energy storage unit i, the state is
read by the step A, when the redox flow battery energy storage unit
is remote controlled, the state value is 1, the rest value is 0;
SOC.sub.redox flow i is the state of charge of the redox flow
battery energy storage unit i; SOD.sub.redox flow i is the
discharging state of the redox flow battery energy storage unit i;
P.sub.redox flow i.sup.maximum allowable discharge is the maximum
allowable discharging power of the redox flow battery energy
storage unit i; P.sub.redox flow i.sup.maximum allowable charging
is the maximum allowable charging power of the redox flow battery
energy storage unit i; R is the total number of the redox flow
battery energy storage unit; P.sub.redox flow i.sup.consumption,
P.sub.redox flow j.sup.consumption is the system power consumption
value of the redox flow battery energy storage unit i and unit j,
said system power consumption value can be obtained by the look-up
table.
[0209] The power consumption values in the formulas mentioned above
all belong to the system power consumption value, in the practical
implementation processing of the present invention technical
solution. Through experimental method the corresponding
relationship graph between the different redox flow battery energy
storage system power consumption value and the charge and discharge
power is determined. The experimental methods specific steps:
First, manually setting the redox flow battery energy storage
sub-unit charging and discharging power, respectively, in the
offline comprehensive experiment to determine, the redox flow
battery energy storage unit in the charging or discharging state,
the corresponding relationship between the different charging and
discharging power value and the system power consumption value and
the redox flow battery energy storage unit system power consumption
in the zero-power state. Then, based on these data, the different
redox flow battery energy storage unit charts can be determined
[0210] In this example, by above method experimenting with a 175 kW
redox flow battery storage unit, obtaining the corresponding
relationship graph, shown in FIG. 4, the real-time system power
consumption value of unit be obtained from FIG. 4 by the look-up
table. In this case, taking the above formula (32) of the system
power consumption value as an example to explain, and then finding
the power value of equality sign right above equality big braces
(wherein, P.sub.redox flow i is obtained by equation (30)), in FIG.
4 the ordinate value which corresponds to the power value is looked
up, the ordinate value is the system power consumption P.sub.redox
flow j.sup.consumption of the 175 kW redox flow battery storage
unit; the power consumption of other units also obtained according
to the look-up table, so it need not be discussed here.
[0211] FIG. 4, the ordinate value is the system power consumption
value of the unit, the abscissa value is charging and discharging
power value of a 175 kW redox flow battery storage unit, wherein
the abscissa is 0, it indicates 175 KW redox flow battery energy
storage unit is in the zero power hot standby state; the abscissa
is in positive value, it indicates that 175 KW redox flow battery
energy storage unit is in the discharging state; the abscissa is in
negative value, it indicates that 175 KW redox flow battery energy
storage unit is in the charging state.
[0212] The method and system of the present invention, the IPC and
communications platform complete lithium battery and redox flow
battery energy storage systems hybrid energy storage power station
real-time power distribution method, can achieve the purpose of
lithium battery and redox flow battery energy storage systems
hybrid energy storage power station real-time power effective
control and distribution. With the technical solution, the present
invention has a function of real-time distributing the lithium
battery and redox flow battery energy storage systems hybrid energy
storage power station total active power demand, real-time
monitoring SOC values and other functions, and thus can be
accurately, conveniently and effectively implements the
lithium-flow joint battery energy storage station power real-time
control function.
[0213] If only based on lithium battery and redox flow battery
energy storage systems hybrid energy storage power station total
power demand and each battery energy storage unit state of charge
SOC, each battery energy storage units power command value of the
battery energy storage power station is directly calculated, it can
leads to situation which battery storage energy unit power command
value exceeds the upper and lower limits of the allowable charging
and discharging power (depth). Then when that may incur the
situation that the battery storage energy unit power command value
exceeds the upper and lower limits of the allowable charging and
discharging power (depth), when this overrun occurs, if not make a
timely adaptive correction and online processing, may lead to power
command value exceeds the device working ability which led to the
error of each battery storage unit distribution power becomes
large, and there are drawbacks which difficult to meet the entire
battery energy storage station total power demand;
[0214] Precisely because of the present invention increases the "by
filtering method and lithium redox flow battery energy storage
sub-station allowable charging and discharging power constraint
condition to determine lithium redox flow battery energy storage
sub-station power command value, and then based on the lithium
redox flow battery energy storage sub-station power command value
to determine the state of the lithium redox flow battery energy
storage power station, respectively, and through corresponding
control strategies and greedy algorithms to calculate each battery
energy storage unit power command value of the lithium redox flow
battery energy storage sub-station, while effectively consider the
allowable charging and discharging power constraint condition of
which can express the characteristics of the lithium redox flow
battery energy storage unit real time power (i e, each lithium
redox flow battery energy storage unit maximum allowable
discharging power, each lithium redox flow battery energy storage
unit maximum allowable discharging power and other constraint
condition.) as well as the redox flow battery energy storage unit
system power consumption to the control algorithms and systems" and
other steps, so not only overcome the above drawbacks, but also
have an better online distribution and real-time monitoring effect
for each lithium battery energy storage unit and each redox flow
battery energy storage unit in large-scale megawatt lithium battery
and redox flow battery energy storage systems hybrid energy storage
power station, more convenient for application and
Implementation.
[0215] At last, in this description of the embodiments, we have
detail describe the present invention according to a particular
example. The detail embodiment is one example of the invention but
not the only one, so the person in this field must be understand
that all the alternatives and other equal and/or similar examples
are all within the range of the invention and they are all
consistent with the spirits of this invention, are all protected by
our claims.
* * * * *